EP1998930A1

EP1998930A1 - Positioning device

Info

Publication number: EP1998930A1
Application number: EP07711799A
Authority: EP
Inventors: Sönke KOCK; Sven Soetebier; Wolfgang Waldi
Original assignee: ABB AG Germany
Current assignee: ABB AG Germany
Priority date: 2006-03-13
Filing date: 2007-03-06
Publication date: 2008-12-10
Anticipated expiration: 2027-03-06
Also published as: JP2009529434A; CN101400476B; ATE467478T1; ES2346257T3; CA2643976A1; KR20080109755A; EP1998930B1; CN101400476A; DE502007003731D1; US20090065664A1; WO2007104446A1; RU2441743C2; JP5430947B2; RU2008140322A; MX2008011703A; CA2643976C; BRPI0709591A2; KR101319366B1; US8225692B2; DE102006011823A1

Abstract

A positioning device includes a supporting structure, a work carrier, at least six length-adjustable struts arranged in strut pairs, each strut being moveably mounted to the supporting structure and to the work carrier and at least one drive configured to adjust a length of at least one of the struts. The struts of each strut pair are disposed parallel to each other and each strut pair has a pivot bearing disposed at a first end of each strut and a second bearing disposed at a second end of each strut.

Description

positioning

description

The invention relates to a positioning with a support structure, with a workpiece carrier and with length-adjustable struts, which are each connected on the one hand to the support structure and the other with the workpiece carrier, wherein the struts are movably mounted at the connection points with the support structure and the workpiece carrier, wherein at least one Part of the struts is adjustable in length and wherein at least a portion of the struts has a drive for length adjustment.

Different positioning devices of the generic type are known from the prior art, which are used in various fields of technology. The known positioning devices serve to hold an object in position. Such positioning devices are therefore used, for example, to position a workpiece relative to a tool so that the workpiece can be machined with the aid of the tool. For example, in the automotive industry, a body part of a vehicle is positioned in a workstation or the like by means of usually several positioning devices. The thus positioned body can then be processed by, for example, welding robots.

Thus, US Pat. No. 5,787,758 describes a three-axis positioning device which serves to position objects such as workpieces, tools, sensors, optical surfaces and so on. The known positioning device has a support structure, the actuators is connected to an adjustable machine component. The machine component receives the object and can be moved and positioned by driving the actuators relative to the support structure. However, the machine component should only be able to be moved in the direction of the axes of a Cartesian coordinate system of the machine component whose original component jump is firmly connected to the machine component. A tilting, pivoting or turning of the machine component about these axes should be prevented. For this purpose, the known positioning on three struts, which are hinged on the one hand to the support structure and on the other hand on the machine component. The struts are connected to the said parts and formed so that they prevent pivoting of the machine component about these axes. The struts have two strut sections, which are hinged together, so that the length of the strut can be adjusted or changed by opening and closing.

Such positioning devices have the particular disadvantage that they have a large space and space requirements. This leads in particular to the arrangement of the positioning device in a production line or the like to problems because here little space between the robots, conveyor belts, components and so on is available on a regular basis. Furthermore, the known positioning devices do not have the necessary rigidity to meet the sometimes very high loads can. In addition, the assembly of the known positioning designed as consuming.

The object of the invention is to provide a positioning device which is compact and space-saving and has a high rigidity.

This object is achieved by a positioning with a support structure, with a workpiece carrier and with length-adjustable struts with the features specified in the patent claim 1.

Accordingly, a positioning device according to the invention of the type mentioned above is characterized in that at least six of the struts are arranged in pairs, that in a strut pair, the struts are arranged in parallel, that each strut pair at a first end of the longitudinal extension of the struts has a pivot bearing, and that each strut pair at a second end of the longitudinal extent of each strut has a second bearing. In this way it is ensured according to the invention that, although each strut receives individual forces, each pair of struts, considered as a couple of forces, can also absorb a moment. As a result, the average load of the struts is reduced. In addition, the parallel arrangement of the struts to strut pairs under special embodiments of the pivot bearing at one end of the longitudinal extension of the struts on an advantageous rigidity of the overall construction. Another advantage of such an arrangement of struts is the fact that the positioning is designed to be relatively compact in terms of the forces and moments that they can endure.

In an advantageous embodiment of the subject of the application, the strut number is exactly six.

Thus, the position device has exactly three variable-length strut pairs, which pass on the supporting structure in a particularly favorable manner, the forces and moments of a workpiece in the support structure with a corresponding spatial arrangement.

According to the invention, it is also provided that each strut pair has a common drive.

In this way, the positioning device is more compact overall and the control effort to control the drives is correspondingly lower.

It is also advantageous if the drive is connected with an angle-faithful connection with the respective strut pair, in particular a belt, a toothed belt, a gear or gears.

Further advantageous embodiments of the positioning device according to the invention can be found in the further dependent claims.

Reference to the embodiments illustrated in the drawings, the invention, advantageous embodiments and improvements of the invention and its particular advantages to be explained and described in detail. Show it:

1 shows a first basic scheme of a variable-length column pair,

2 shows a first scheme for coupling a pair of supports,

3 shows a three-dimensional view of a first embodiment of a positioning device,

4 is a plan view of the embodiment of the positioning device,

5 shows a detailed representation of a strut pair foot of the positioning device,

6 shows a second detail of the strut pair foot, partly as

Cross-sectional view executed

7 is a schematic diagram of a toothed belt drive for a support pair,

8 is a detail view of the strut heads of the strut pair,

9 shows a first example position,

10 is a second example position,

Fig. 11 shows a third example position as well

12 shows a fourth example position of the positioning device,

13 shows a second scheme for coupling a column pair,

14 is a third scheme for coupling a pair of supports,

15 shows a second example of a common drive for a strut pair,

16 is a detailed view of the second example in the strut pair,

17 shows a first arrangement example,

Fig. 18 shows a second arrangement example of a strut pair with separate

Brakes, as well

Fig. 19 is a third arrangement example.

1 shows a basic diagram 10 of a pair of supports according to the invention of a positioning device, in which a first strut 12 and a second strut 14 are arranged parallel to one another and with a distance predetermined by the construction. Both struts 12, 14 are adjustable in length, which is shown in the first scheme 10 by a piston-cylinder assembly 16. Here are different types of drive conceivable, such as hydraulic, pneumatic or electric, but also a mechanical length adjustment, which in turn is then moved by a pneumatic, hydraulic or electric drive. Likewise, in addition, a manual Adjustment conceivable to use for example by means of a crank in the event of a drive failure.

The struts 12, 14 are fixedly connected to a first 18 and a second universal joint 20 with a support structure 22 at a first end of its longitudinal extension, shown in FIG. In this case, each universal joint 18, 20 each have a first 24 and a second pivot bearing 26. The respective first pivot bearing 24 are fixedly connected to the support structure 22 and have a construction-related fixed distance from each other. In addition, the first pivot bearings 24 are arranged so that they have a common first pivot axis 28. At the second end of their longitudinal extension, the struts 12, 14 each have a third pivot bearing 30, these third pivot bearings 30 are mounted together on a fourth pivot bearing 32. In this way it is ensured according to the invention that the third pivot bearings 30 have a predetermined distance from each other by the construction and also pivot together on a second pivot axis 34. The second pivot axis 34 is spaced by a predetermined amount from the pivot axis 28 whereby the required length of the strut pairs is determined. The common pivot bearing 32 with pivot axis 34 is in turn fixedly connected to a usable as a workpiece carrier, moving platform 38. In this way, the platform 38 receives the mobility symbolized by the arrows in FIG. 1 in relation to a fixed support structure 22. In this case, depending on the position and orientation of the platform, the distance of the pivot axis 28 and 34 changes, for example, axis 34 can extend to the position of axis 36.

With the above-described bearing scheme for the lower support of the struts 12, 14, the degrees of freedom for the storage are achieved in total, which are shown by the arrow directions with the designations X, Y and Z in the figure.

For a common and length-synchronous mechanical drive of the strut pairs three versions are possible according to the invention Fig. 2 shows a first scheme 40 for kinematic coupling of the strut pair, which transmits the drive power of a motor on a strut pair in a certain way by means of a hinge assembly. In the case of a positioning device according to the invention, the drive power of the motor can be determined independently of the position and orientation of the motor by means of a hinge arrangement. pivoted strut pair are transmitted without causing a jamming or jamming. In each case one of the two shafts 42 and 43 can be used as drive or driven side. If, for example, shaft 42 is used as the output-side shaft, then it is to be arranged parallel to the respective strut axis 12 or 14 from FIG. 1. The drive-side shaft 43 is decoupled from the position and orientation of a strut by the described hinge assembly and can be associated with its pivot bearing 46 either a support structure 22 or the axle of the pivot bearing 24. According to the invention, two hinge assemblies 40 are needed to drive a strut pair. This makes it possible to distribute the drive power required for strut adjustment of a drive on both struts. It does not matter at which end of the struts the respective bearings are arranged. In Fig. 1, the joint combinations 30, 32 and the individual joints of the universal joints 18, 20 could be replaced or replaced with each other. Thus, both joints 30, 32 could also be arranged at the upper end of the struts 12, 14, while the cardan joints 18, 20 could then be arranged at the lower end. Accordingly, the hinge assembly 40 may be associated with either the platform side hinges or the joints of the support structure to transfer the drive power to the strut pair. Between a first 44 and a second pivot bearing 46, a torsionally rigid length compensation element 48 and a third universal joint 50 is disposed on the first axis of rotation 42. In this way, the function of a common and synchronous mechanical drive of the strut pairs with standard elements of the art is realized with particularly favorable technical means. It is conceivable that the bearing forces of the two pivot bearings 44 or 46 are accommodated in a common housing.

3 shows a first positioning device 52 as a three-dimensional view. A base plate 54 is connected to first connecting elements 56 with a first 58, a second 60 and a third strut pair 62. The base plate 54 is approximately honeycomb-shaped, wherein a first end of the strut pairs 58, 60, 62, namely the lower end, is arranged on each second side of the base plate 54. In this way, a line-symmetrical starting position for the strut pairs 58, 60, 62 is achieved, which has a particularly favorable effect on the forces to be absorbed by the positioning device 52 and their forwarding. Each strut of the strut pairs 58, 60, 62 is plate 66 connected at its upper end by means of a respective universal joint 64 with a tool. The universal joints 64 are cardan joints and the tool plate 66 designed in the present example as a disc. When spacing the universal joints 64 of each strut of a pair of struts 58, 60, 62, care has been taken that the struts may be parallel to one another. In addition, the diameter of the tool plate 66 is selected smaller than the outer diameter of the base plate 54, so that the pairs of struts each have a certain angle to an imaginary vertical on the base plate 54, at least in a starting position in which the pairs of struts have an equal length. However, this starting position can change accordingly according to the length adjustment possibility of the individual struts.

The tool plate 66 has a number of recesses 68, such as holes, through holes or threaded holes that allow mounting of various tools on this tool plate 66. In simple cases, such a tool is a pin, a fixing gripper or other connecting element with the workpiece.

Based on the first strut pair 58, various components are to be explained in more detail, each of the strut pairs 58, 60, 62 has. In this case, the first strut pair 58 has a first 70 and a second strut 72, which consists essentially of a first 74 and a second cylindrical member 76. The second cylindrical component 76 is guided in the first 74 so that a telescopic extension of the components 74, 76 is made possible, wherein preferably the cylindrical components 74, 76 against each other have a rotational degree of freedom along the common axis of symmetry, which is why according to the invention on the struts only Zug- and compressive forces, but no moments can be exerted and a distortion of the positioning is avoided. Usually, the extension of the components via a built-spindle or screw.

By a universal joint 64 to each of the struts 70, 72 ensures that the predetermined distance between the struts at the connection point to the tool plate 66 is not changeable. The universal joint 64 has a gimbal bearing, that is, the struts 70, 72 are provided in principle with a storage, the has two degrees of freedom. At the lower end of the first strut 70, a fifth pivot bearing 78 and correspondingly at the lower end of the second strut 72, a sixth pivot bearing 80 is arranged. The distance of the fifth 78 to the sixth pivot bearing 80 relative to the bearing axis centers corresponds to the distance of the upper universal joints 64 to each other. In this way it is achieved that the struts 68, 70 are arranged in any case parallel to each other, as long as they have an equal length. This is a problem that relates to a synchronous extension or shortening of the struts 68, 70, which will be explained in more detail later.

The fifth 78 and the sixth pivot bearing 80 are mounted with their bearing axes so that they are only perpendicular to a further bearing axis 82 of a seventh pivot bearing 84 are pivotable. In this case, the seventh pivot axis 84 is located tangent to an imaginary circle about a virtual perpendicular to the base plate 54 and in the center thereof.

For a common and length-synchronous drive their length adjustment, the first strut pair 58 on a common electric drive 86 which is connected in the lower region of the struts 70, 72 with a connecting element 88 with a support member 90. The support member 90 is connected to the bearing axis 82 so that it pivots with rotation of the axis with and pivoted in this way, both the connecting element 88 and the electric motor 86 in the case of a pivoting movement. In this way, it is ensured that the relative position of the electric motor 68 does not change to the strut feet of the first strut pair 58. The details of a possible power transmission or torque transmission from the electric motor 68 to the first strut pair 58 will be explained in more detail later, since in principle there are several possibilities.

FIG. 4 shows the first positioning device 52 in a plan view from above onto the tool plate 66, wherein the pairs of struts 58, 60, 62 have the same length, so that the tool plate 66 is arranged exactly above the base plate 54 in this view. In this figure, the reference numerals for like parts, as also seen in Fig. 3, are used accordingly. From this figure, by drawing in the pivot bearing axes, namely the bearing axis 82 and the corresponding pivot bearing axes of the further pairs of struts 60, 62, it is possible to deduce that a sym- metric arrangement of the pairs of struts 58, 60, 62 was selected in an equilateral triangle, at least in this initial position of the tool plate 66 a favorable, uniform and symmetrical distribution of forces and moments that could act on the tool plate 66, on the individual strut pairs 58, 60, 62 causes. In this way, a favorable same design of each of the individual components is possible, and given the opportunity by the same design of the strut pairs 58, 60, 62 and their bearings and drive in each case only one drive or struts paarart to construct and produce, which then gives the corresponding positioning device.

Fig. 5 shows an enlarged detail of the foot of the first strut pair 58, wherein the electric motor 68, the connecting element 88, the sixth pivot bearing 80, the bearing axis 82 and the first connecting element 56 are shown enlarged. In the figure, significantly lower connecting elements 92 are shown, which connects the first cylindrical member 74 of the first strut 70 fixed to a first pivot fork 94 of the fifth pivot bearing 74. With a corresponding pivoting fork 94 and the sixth pivot bearing 80 of the second strut 72 is connected.

In this figure is also shown enlarged that a mechanical connection between a lower assembly 96 and the second cylindrical member 76 and the corresponding component of the second strut 72 is made.

Fig. 6 shows in a cross section through the bearing axis 82, a first embodiment of the mechanical connection 95 in the form of a fourth 98 and a fifth universal joint 100 according to the first scheme in Fig. 2. The universal joints 98, 100 are connected on one side with rods 102, the cause a rotational movement of the second cylindrical member 76 under the corresponding component of the second strut 62. On the other hand, the universal joints 98, 100 are connected to coupling elements 104, which in turn are connected to drive shafts 106. In the lower assembly 96, not shown, it is ensured that the drive 86 both drive shafts 106 drives at a same speed, so as to ensure that the strut pairs extend or shorten evenly in their longitudinal extent. In the illustrated embodiment of the first strut pair 58, this should be done by the common drive by a common gear, but in this figure does not fall into the image plane and thus is not shown. In this type of Drive is to ensure that one of the second components 76 is stretched by a left-hand rotation while the other is driven by a clockwise rotation and thus extended by a clockwise rotation (or vice versa). When shortening, the drive acts with a correspondingly reversed direction of rotation.

Fig. 7 shows a second embodiment possibility for driving a length adjustment of strut pairs, the essential difference between the embodiment of the preceding figure and this is seen in that a second electric motor 108 drives a toothed belt 110, which is also guided over the drive wheels 112 which substantially fulfill the function of the drive shafts 106 of the previously presented embodiment. The tension in the toothed belt is achieved by means of two adjustable tension rollers 107, which apply to a toothless rear side of the toothed belt 110 a predetermined by the setting force, and hold the toothed belt 110 in this way to a predetermined by the design bias. In the second embodiment 107, a drive of the second cylindrical components 76 is also achieved, which is in the same direction, so that in the construction of the struts is advantageously not to pay attention to a rotation in the drive of the components.

Fig. 8 shows the upper end of the pairs of struts 58, 60, 62 at their junction with the tooling plate 66. Also in this figure, known parts and components are provided with the corresponding reference numerals as previously introduced. In Fig. 8, the hinge axes 114 are located so that the degrees of freedom of the joints are as visible as possible. Namely, in the next following figures, it is shown how possible positions with the first positioning device 52, which are provided with such joints 64, appear.

9 shows a first position 116 of the first positioning device 52, in which the workpiece plate 66 is arranged exactly in the center above the base plate 54 and, moreover, the pairs of struts 58, 60, 62 have been retracted to their minimum length.

10 shows a second position 118 of the first positioning device 52, in which the tool plate 66 is likewise arranged exactly centrally above the base plate 54, but the strut pairs 58, 60, 62 have their maximum length. In the context Referring to Fig. 10 with Fig. 9, it can be seen how the tooling plate 66 is positionable along one of its axes of motion.

11 shows a third position 120 of the first positioning device 52, in which the pairs of struts 58, 60, 62 have an average length in comparison to that of FIGS. 9 and 10.

Fig. 12 shows a fourth position 122 of the first positioning device 52, in which the left in the image to be seen pair of struts has a shorter longitudinal extent than the other two pairs of struts, so that in the result, the tool plate 66 almost immediately o- above the left in the picture is arranged to see struts pair. In this case, the tool disk disk is further arranged parallel to the base plate 54, as in the figures before. The figure makes it clear that, depending on the force and moment effect on the tool plate 66 not only pressure forces on the strut pairs 58, 60, 62 can act, but also tensile forces, depending on how the force or torque acts on the tool plate 66.

Fig. 13 relates to a second embodiment 124 of a lower assembly, which transmits the drive power of a motor to a strut pair in a certain way. In this case, this figure shows only a diagram of the interaction of different components, the symbolism of the components was selected as shown in Fig. 1 or 2. Therefore, only the essential differences in comparison to the preceding drive systems will be described in the following.

The drive power for a fourth strut pair 126 is provided by a drive shaft 128. How the drive shaft 128 itself is driven, is not shown in detail, but this can be done pneumatically, hydraulically, electrically or in other ways known in the art. Via a gear 130, the drive power of the drive shaft 128 is transmitted to the struts of the fourth strut pair 126. In the example chosen, the transmission 130 has a first pinion 132 which is connected to a first connecting shaft 134 and rotates in the drive case. The rotation causes the drive of a second pinion 136, which is arranged on a first strut rod 138. Accordingly, a third pinion 140 disposed on the drive shaft 128 drives a second drive shaft 142, which in turn drives a fourth pinion 144 drives, which in turn is arranged on a second strut rod 146. The strut rods 138, 146 are rotatable about their longitudinal axis and stored accordingly, wherein the pointing in the strut end storage, in the manner already described above with a gimbal 148 is mounted. In order to receive the bearing forces of a second bearing on the strut rods 138, 146, connecting rods 150 are provided which connect the drive with the said bearing. This is symbolized in the figure by the respective connecting rods 150, which connect the corresponding bearing symbols on the drive shaft 128 with the bearing symbols on the strut rods 138, 146. Just as well, it is also conceivable that instead of such connecting rods 150, a housing or the bearing forces receives. A torsionally rigid length compensation 127 finally allows the common pivoting of the strut pair about the axes of rotation 26, without affecting the transmission of the drive power.

As shown in FIG. 14, a third embodiment 152 of the drive according to the invention employs a belt drive 152, which can be designed, for example, as a toothed belt or a V-belt or as a pull belt, in order to drive two drive wheels 154. The drive wheels 154 each act on a first bevel gear 156 of a bevel gear 158, which drives a second bevel gear 160 of the bevel gear 158, which acts on strut rods 162. These strut rods 162 are gimbals mounted in a universal bearing 164.

Fig. 15 shows an embodiment of the third embodiment 152, which is shown schematically in Fig. 14 and is shown in this figure as a design proposal in principle. Therefore, the corresponding visible components are also provided with the reference numerals corresponding to FIG.

In this embodiment, it has been found to be particularly favorable that various technical functions are each in a plane that are identified by corresponding quadrangles in the figure. This results in a first level 166 in which the drive via the drive wheels 154 and the drive belt 153 takes place. A second plane 168 is formed by the strut rods 138, 146 and the corresponding bearings at the two ends of the strut rods 138, 146. A third plane 170 is formed by a tool disk, but not in this figure 4, while a fourth plane 172 is defined by the axes of rotation of the drive wheels 154. Finally, a fifth plane 174 is still visible, which is parallel to the fourth plane 172 and defined by a bearing 176, namely a pivot bearing, which is closest to a support leg 178. Here, the support leg 178 of the connecting element to a base structure, not shown in this figure to which this embodiment could be connected.

Fig. 16 is a sectional view of the third embodiment 152, and therefore reference numerals are used as before. In particular, it should be pointed out in this figure that a rotary motor 178 is arranged so that it drives one of the drive wheels 154 by means of a shaft 180. The other drive wheel 154 is in turn driven by the drive belt 153, which drives another shaft 182. Via the shaft 180 and the further shaft 182, the corresponding secondary shafts 184 of the length-adjustable struts 186 are driven. The distance between the individual adjustable struts 186 is fixed both by the design-related distance of the shaft 180 and the further shaft 182 and by the connection point with a tool plate, not shown, at the other end of the length-adjustable struts 186 in the region of the upper universal joints 190. On the further shaft 182, a brake 188 is arranged on the side facing away from the drive wheel 154, which blocks the further shaft 182, if necessary. In this way it can be ensured with simple means that the length-adjustable struts 186 are fixed in a predetermined position, without the drive would have to absorb any forces acting. This gives this arrangement special mechanical stability.

Other measures that contribute to stability in this arrangement include the use of power transmission gears, such as a bevel gear 192 that transmits, as in a 90 ° bevel gear, the attack drive forces of the further shaft 182 to one of the secondary shafts 184.

In addition, a separation of functions is achieved in this arrangement, in which the rotary motor 179 acts on the shaft 180 and the first brake 188 on the further shaft 182. In this way, a particularly compact arrangement of the individual technical functions is achieved. A further brake arrangement is shown in FIG. 17, which again represents a detailed representation of the first strut pair 58, wherein it is only to be shown that in this figure a second brake 194 is already integrated in the electric motor 86.

Fig. 18 shows an embodiment of the brake 196, which has two partial brakes, arranged on a rotary shaft and a further rotary shaft, which drives in each case the corresponding secondary shafts of the two struts. In this constellation a brake redundancy is achieved. Even if one of the partial brakes of the third brake 196 should fail, the other partial brake brakes both secondary shafts via the mechanical active coupling as well as the secondary shaft, which is then not directly braked. In addition, the brakes are easily accessible, which simplifies the maintenance and control of the brakes.

Fig. 19 shows another way and position to arrange a pair of brakes 198. In this example, second partial brakes are in turn integrated in each of the struts, so that the partial brake act directly on the secondary shafts and can thus fix each individual strut by the corresponding braking forces.

Here, the advantage lies in the fact that the design is even more compact and also the mechanical redundancy of the brake is maintained.

LIST OF REFERENCES

Basic scheme first strut second strut

Piston-cylinder assembly first universal joint second universal joint

Support structure first pivot bearing second pivot bearing first pivot axis third pivot bearing fourth pivot bearing second pivot axis

axis

Workpiece carrier first scheme / joint arrangement upper shaft lower shaft first pivot bearing second pivot bearing

Length compensation element third universal joint first positioning device

Base plate first connecting element first strut pair second strut pair third strut pair

universal joint

tool plate

recess first strut second strut first cylindrical element second cylindrical element fifth pivot bearing sixth pivot bearing

Bearing axle seventh pivot bearing

Electric motor second connecting element

Supporting part Third connecting element First pivoting bow Mechanical connector Lower assembly Fourth cardan joint Fifth cardan joint

rods

coupling member

Drive shaft second embodiment second electric motor

toothed belt

drive wheels

Joint axes first position second position third position fourth position third embodiment fourth strut pair

drive shaft

Gear first pinion 134 first drive shaft

136 second pinion

138 first strut bar

140 third sprocket

142 second drive shaft

144 fourth pinion

146 second strut bar

148 cardanic storage

150 connecting rods

152 fourth embodiment

154 drive wheels

156 first bevel gear

158 bevel gearbox

160 second bevel gear

162 strut bars

164 universal storage

166 first level

168 second level

170 third level

172 fourth level

174 fifth level

176 depository

178 support foot

179 rotary engine

180 wave

182 more wave

184 secondary shaft

186 length-adjustable struts

188 first brake

190 upper universal joints

192 bevel gear

194 second brake

196 third brake

198 fourth brake

Claims

claims

1. Positioning device with a support structure (22), with a workpiece carrier (38) and with length-adjustable struts (70, 72, 186) which are respectively connected on the one hand to the support structure and on the other hand to the workpiece carrier (22), wherein the struts (70 , 72, 186) are movably mounted at the junctures with the support structure and the workpiece carrier (38), at least a portion of the struts (70, 72; 186) being adjustable in length and at least a portion of the struts (70, 72; 186) a drive for length adjustment, characterized in that at least six of the struts (70, 72, 186) are arranged in pairs, that in a strut pair (58, 60, 62, 126), the struts (70, 72, 186) are arranged in parallel in that each strut pair (58, 60, 62; 126) has a pivot bearing (24, 26, 30, 32; 78, 80; 84) at a first end of the longitudinal extent of the struts (70, 72; 186), and that each Strut pair (58, 60, 62; 126) at a second end of the L Elongation of each strut (70, 72) has a second bearing.

2. Positioning device (52) according to claim 1, characterized in that each strut (70, 72) of a strut pair (58, 60, 62, 126) has a pivot bearing (24, 26, 30, 32, 78, 80, 84) and in that the pivot bearings (24, 26, 30, 32, 78, 80, 84) have a common bearing axis centerline.

3. positioning device (52) according to claim 1 or 2, characterized in that the strut number is six.

4. Positioning device (52) according to any one of the preceding claims, characterized in that the drive is a hydraulic, pneumatic or electrical.

5. Positioning device (52) according to any one of the preceding claims, characterized in that each strut pair (58, 60, 62, 126) has a common drive.

6. Positioning device (52) according to claim 5, characterized in that the drive with a belt, a toothed belt 110), a transmission (130) or gears or another angle-faithful connection with the respective strut pair (58, 60, 62; ) connected is.

7. Positioning device (52) according to any one of the preceding claims, characterized in that each strut pair (58, 60, 62; 126) is associated with a braking device, with the required drive or at least one driven by the drive component (74, 75 , 76) is brakable or fixable.

8. positioning device (52) according to one of the preceding claims, characterized in that the first end of the support structure is associated.

9. positioning device (52) according to one of the preceding claims, characterized in that a third bearing is arranged at the first end.

10. Positioning device (52) according to any one of the preceding claims, characterized in that the sum of the degrees of freedom of the pivot bearing (24, 26, 30, 32, 78, 80, 84), the second and the third bearing the degree of freedom of the expected load equivalent.

11. Positioning device (52) according to any one of the preceding claims, characterized in that as bearings pivot bearings (24, 26, 30, 32; 78, 80; 84), Kar- danische bearings, can be used.

12. Positioning device (52) according to any one of the preceding claims, characterized in that the drive and / or the struts have position measuring devices.

13. Positioning device (52) according to claim 12, characterized in that with a control device and with position information of the position measuring devices, the position of the workpiece carrier or its position in space can be predetermined.